Illustrator 27 inverting colors when saving pdf

Hi!

I have a document that's getting some colors inverted when I save to pdf using the preset provided by our printer. We've saved this document the same way many times in the past using the same preset with no issues, so I assume it's something to do with the latest illustrator update.
So the preset I'm supposed to use has the color conversion set to "convert to destination (perserve numbers)" with the destination as "US Web Coated (SWOP) 2".
If I change it to no color conversion the colors are fine.

Things I've tried: There was a document that was placed on the artboard that had a spot color in it, I deleted that and deleted the spot color swatch. I restarted illustrator, then restarted my computer. I tried having a colleague save the file. I copied all of the artwork and pasted it onto a new artboard. I tried just recreating some of the elements without using the eye dropper.

I've attached some pictures to show what I mean. It's only on some text and shape objects, and it's only effecting the second page/back of the document.